Perhaps because the power supply is the limiting factor. Scott K9MA
---------- Scott Ellington. K9MA --- via iPhone > On Aug 17, 2018, at 8:43 AM, "j...@kk9a.com" <j...@kk9a.com> wrote: > > So why do most RTTY users run their amps at reduced power? > > John KK9A > > > From: Charlie K3ICH > Date: Fri Aug 17 09:24:18 EDT 2018 > > > I really do NOT understand why this data is so surprising. > It all seems to me to be perfectly normal with the amplifier's highest > efficiency occurring at near max output. > Which curiously, I would assume, is the way the amp was designed. > > Think zero output with zero drive = zero efficiency. > Apply some drive, read some output and the efficiency goes up from there. > > 73, Charlie k3ICH > > > > > -----Original Message----- > From: elecraft-bounces at mailman.qth.net <elecraft-bounces at > mailman.qth.net> On > Behalf Of john at kk9a.com > Sent: Friday, August 17, 2018 8:57 AM > To: elecraft at mailman.qth.net > Cc: charles at k5ua.com > Subject: [Elecraft] KPA-1500 Efficiency As A Function of Input Power > > Interesting data, Charles. I assumed that running the KPA1500 (or KPA500) > at lower power would keep the fan from running as much. I knew that > efficiency changed with output power but I did not expect that it was this > significant. If your data is correct there is 1000++ watts of heat to > dissipate no matter what power level you use. > > John KK9A > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to k...@sdellington.us ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
